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PROPERTIES OF SOUND
HOW WE HEAR
SPEECH AND MUSIC
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absorption coefficient absorptive material absorptive treatment acoustical design acoustical materials acoustical plaster acoustical tile air space amount approximately architectural acoustics attenuation audience auditorium average balcony Bell Telephone Laboratories blanket building carpet Celotex Corp cent Chapter characteristics church construction cubic feet curve cycles cycles cycles decay decibels diffraction diffusion duct effects example fiberboard fibers floor FREQUENCY IN CYCLES grille hearing inches increases listening located loudness loudspeakers low frequencies microphone mineral wool music rooms National Physical Laboratory noise level open-air theater optimum reverberation painted panel partitions Perforated plywood quency quiet rear wall reduced resonant frequencies room noise sabins shown in Fig side walls sorptive sound insulation sound level sound pressure sound waves sound-absorptive sound-amplification system sound-pressure level speaker spectrum speech and music square stage studios studs surface Table thick tion transmission loss usually ventilating vibration walls and ceiling wavelength wood wool